Tongue firmly in cheek here.
CERN (the European Organization for Nuclear Research) has temporarily shut down the Large Hadron Collider to fix a helium leak. Presumably the helium is from liquid helium coolant for the big electromagnets.
CERN estimates two months before it resumes startup of the LHC . Those expecting microblack holes to eat the Earth must fret a bit longer.
Here is the little bit so far announced.